PC用键盘则恰恰相反，不但价格便宜，稳定可靠，而且是编码键盘，可自动扫描键盘并通过键盘用标准5芯插口发送按键的扫描码。
By contrast, PC keyboards are not only cheap, stable and reliable but also a kind of coded keyboard which can be scanned and send the scan code via a standard 5 core socket automatically.
大写键可以直接打印，键盘驱动程序可以对很多更为特殊的情况进行编码，但是其模型是相同的：按下一个键就代表输入某个特定的字符。
The key caps may be printed differently, and the keyboard driver may encode a few more special cases, but the model is the same: Press a key to type a specific character.
在这个系统中，通信载体、信源编码、虚拟键盘的设计和脑-机接口信号的单次提取是四个最核心的问题。
There are four key issues in the system, that is communication carriers, source coding, designation of virtual keyboard, and the single-trial estimation of its message carriers.
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